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| seating head (When the water pressure tends to press the door/shutter on to the gate frame then the type of water head is called seating /on-seating water head. Oddessita) | |||
| прижимающее давление: 4 phrases in 3 subjects |
| Hydraulic engineering | 2 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |